[llvm] [TypeProf][PGO]Skip vtable-based ICP for which type profiles are known to be unrepresentative (PR #110575)

[Mingming Liu via llvm-commits]

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@@ -132,6 +132,11 @@ static cl::opt<int> ICPMaxNumVTableLastCandidate(
     "icp-max-num-vtable-last-candidate", cl::init(1), cl::Hidden,
     cl::desc("The maximum number of vtable for the last candidate."));
 
+static cl::opt<std::string> ICPKnownUnrepresentativeVTables(
+    "icp-known-unrepresentative-vtables", cl::init(""), cl::Hidden,
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minglotus-6 wrote:

This makes sense. 

I updated the PR to use ` cl::opt<DenseSet<StringRef>> ICPIgnoredBaseTypes`, and will spin off the changes in CommandLine.h/cpp (with unit tests).

https://github.com/llvm/llvm-project/pull/110575